This era of separate ecm and pcm required a “good” scanner to communicate with the two controllers. Key cycle deal was handy for sure.

However.... iirc even a cheap code scanner can read the pcm, and even though you can’t read the ecm codes/data, it usually sets a companion code in the pcm telling you there’s a code in the ecm.

That said.... how much fuel in the tank? This era was known for “1/4 tank syndrome”. Fuel level sensor fails and will read 1/4-1/8, when actually empty.

Hopefully you have no dtcs, if so do what was suggested above and loosen 1,3,4 injection lines and crank away to see if it will prime. If you start getting fuel at the loose lines tighten them and hopefully it will start. If it does start and run you’ll prove that it’s mechanically able, but you’ll need to find where air is getting into the system.